V1.8 lower extrusion alignment tool by natewalck (#129)

printer_mods/README.md

@@ -48,6 +48,7 @@ like so:
 | |[Hour Counter Skirt + Keystone Skirt](./MarcPot/Skirt_Mods)|Skirt mod for a mechanical hour counter and keystone inserts |:x: |:x: |:heavy_check_mark: |
 |mjoaris |[10x11 Cable Chain Endcaps](./mjoaris/10x11_Cable_Chain_Endcaps) |Printable Endcaps for 10x11 Cable Chains |:x: |:heavy_check_mark: |:heavy_check_mark: |
 | |[Mini12864 LCD Mount](./mjoaris/Mini12864_LCD_Mount_for_V2.4) |Swiveling case for the Fysetc Mini12864 LCD |:x: |:grey_question: |:heavy_check_mark: |
+|natewalck |[V1.8 Jigs](./natewalck/v1.8_Jigs) |Jigs for assembling V1.8 |:x: |:heavy_check_mark: |:x: |
 |Nomsplease |[60mm Shaft Jig](./Nomsplease/60mm_Shaft_Jig) |Simple jig for cutting and grinding 60mm Z shafts |:x: |:x: |:heavy_check_mark: |
 | raymondh | [Large Spool Holders](./raymondh/LargeSpoolHolders) | Larger spool holders for KVP spools | :x: | :heavy_check_mark: | :heavy_check_mark: |
 |StvPtrsn |[Skirts for a 320mm Build](./StvPtrsn/320mm_Build) |Skirts for a 320mm build |:x: |:x: |:heavy_check_mark: |

printer_mods/natewalck/v1.8_Jigs/README.md

@@ -0,0 +1,11 @@
+# Jigs for assembling V1.8
+![Lower Extrusion Jig](images/lower_extrusion_jig.jpeg)
+
+## Overview
+These jigs are for aligning extrusions when building V1.8. This allows you to precisely align the extrusions with a minimal amount of work.
+
+## Printing instructions
+Pretty much anything works. A good starting point is 2 perimeters and 10-15% infill.
+
+## Usage
+Loosely assemble the extrustion blind joint and then place the entire blind joint onto the jig. While on an extremely flat surface, press down firmly on both horizontal extrusions and tighten the blind screws.